Automatic detection equipment for leather surface defects

Abstract

The invention discloses automatic leather surface defect detection equipment which comprises a detection table, a detection conveying belt and a visual detection device located above the detection conveying belt are arranged at the top of the detection table, a base close to the front end is fixedly arranged on one side of the detection table, and a first lifting column is rotationally connected to the top of the base. According to the leather flattening device, the first lifting column, the base, the cantilever, the vertical rotating shaft and the suction cup assembly are arranged, the suction cup assembly can flatten soft flaky leather through centrifugal force when rotating after adsorbing the leather, and when the suction cup assembly releases the leather above the detection conveying belt, the leather can fall on the detection conveying belt and is in a flat state at the same time; when the transmission belt drives the leather to pass through the linear array camera at the lower part of the visual detection device, the linear array camera can comprehensively acquire the image of the upper surface of the leather, so that the single surface of the leather can be comprehensively detected, and the leather feeding efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of leather appearance inspection technology, and in particular to an automated inspection device for leather surface defects. Background Technology

[0002] To ensure the surface quality of leather, or in situations where high quality requirements are placed on the leather surface, it is necessary to inspect the leather surface for defects (such as localized dents, tears, and color differences). When surface defect inspection is required, leather surface defect inspection equipment is used. Such equipment is usually equipped with a vision inspection device. The lower part of the vision inspection device is equipped with a line scan camera and a lighting lamp. The line scan camera takes an image of the smoothed leather. The defect analysis module and algorithm module inside the vision inspection device analyze and process the image acquired by the line scan camera, thereby obtaining the surface quality information of the inspected leather.

[0003] However, the surface defect detection equipment in the aforementioned technologies still suffers from low automation efficiency. Specifically, because leather is soft, it is prone to edge pressing when placed on the inspection conveyor belt of the inspection equipment. When leather with pressed edges passes through the vision inspection device, the line scan camera cannot fully capture the image of the leather's surface. To solve this problem, the leather on the inspection conveyor belt is usually manually flattened. However, for the inspection and processing of a large number of sheet-like leather surface defects, this manual flattening method suffers from low automation efficiency. In addition, existing automated inspection equipment does not have the function of simultaneously inspecting defects on both sides of the leather. After inspecting defects on one side of the leather, it is still necessary to manually flip it over and inspect the other side, which will greatly reduce the efficiency of batch leather inspection.

[0004] Therefore, this invention proposes an automated detection device for leather surface defects. Summary of the Invention

[0005] The purpose of this invention is to provide an automated detection device for leather surface defects in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An automated inspection device for leather surface defects includes an inspection table. A conveyor belt and a visual inspection device are mounted on the top of the inspection table. A base is fixedly mounted near the front end of one side of the inspection table. A lifting column is rotatably connected to the top of the base. A cantilever is fixedly connected to the top of the lifting column. A vertical rotating shaft is mounted at the free end of the cantilever. A suction cup assembly is fixedly connected to the bottom of the vertical rotating shaft. A positioning seat is fixedly connected near the rear end of one side of the inspection table. A connecting tube is rotatably connected to one side of the positioning seat. A transition belt transmitter located at the rear end of the conveyor belt is fixedly connected to the outer wall of the connecting tube via a connecting arm. A pad is fixedly mounted on one side of the inspection table. A carrier plate is fixedly connected to the top wall of the pad via a second lifting column. A turntable is mounted in the middle of the carrier plate. Two centrally symmetrical support plates are mounted on the upper part of the turntable. The two support plates and the turntable slide in a sliding engagement along the radial direction of the turntable.

[0007] As a further description of the above technical solution: The suction cup assembly includes a disc and three circumferentially evenly distributed leather suction cups fixedly disposed below the disc. The bottom end of the vertical rotating shaft is fixedly connected to the middle of the top wall of the disc. A positioning sleeve is fixedly disposed on the cantilever and sleeved outside the vertical rotating shaft. The positioning sleeve is rotatably connected to the vertical rotating shaft. A venting device is disposed outside the positioning sleeve. The venting device is provided with connectors that are respectively connected to each leather suction cup through pipes. The connectors are fixed relative to the vertical rotating shaft. The venting device is provided with a vent pipe that is fixed relative to the positioning sleeve.

[0008] As a further description of the above technical solution: The ventilation rotator includes an inner sleeve and an outer sleeve. The inner sleeve is fixedly fitted onto the positioning sleeve and located below the cantilever. The outer sleeve is fitted onto the outside of the inner sleeve and the two are rotatably connected. The outer peripheral wall of the inner sleeve has an annular groove. The inner sleeve is a hollow structure and has a through hole 1 that connects the annular groove and the hollow cavity of the inner sleeve. The outer sleeve is also a hollow structure, and its inner peripheral wall is located within the annular groove. The inner peripheral wall of the outer sleeve has a through hole 2 that connects to its hollow cavity. The ventilation pipe is fixedly installed on the top wall of the inner sleeve and communicates with the hollow cavity of the inner sleeve. The connector is fixedly installed on the outer peripheral wall of the outer sleeve and communicates with the hollow cavity of the outer sleeve. The bottom wall of the outer sleeve is fixedly connected to the top wall of the disc by a fixing rod.

[0009] As a further description of the above technical solution: The transition belt transmitter includes a frame and a transmission belt located within the frame. One side of the frame is fixedly connected to one end of the connecting arm. An air box is fixedly connected to the outer wall of the connecting pipe. A transmission pipe is fixedly connected to the top wall of the air box. A diverter pipe is fixedly connected to the free end of the transmission pipe. A row of nozzles is fixedly connected to the outer wall of the diverter pipe. One side of the positioning seat is fixedly connected to one side of the detection platform. A bearing shaft sleeved on the outside of the connecting pipe is fixedly connected to the rear side of the positioning seat. The bearing shaft and the connecting pipe are rotatably connected.

[0010] As a further description of the above technical solution: The number of lifting columns is two, and they are respectively located near both ends of the carrier plate. The carrier plate has a through hole in the middle that is connected to the turntable for rotation. The top of the carrier plate is fixedly connected to the auxiliary rails located on both sides of the turntable. The top wall of the turntable is fixedly connected to the main rail. The bottom of the support plate is fixedly connected to the sliding plate that is adapted to slide with the main rail and the auxiliary rail. The bottom of the carrier plate is rotatably connected to the main shaft through the base. The top of the main shaft is fixedly connected to the drive gear that meshes with the outer peripheral wall of the turntable.

[0011] As a further description of the above technical solution: The bottom of the turntable is rotatably connected to two coaxial transmission shafts that are symmetrical about the center of the turntable. The bottom of the support plate is fixedly connected to a transmission sleeve that screws through the transmission shafts. The bottom of the turntable is rotatably connected to a second main shaft. One end of the second main shaft is fixedly connected to a driving bevel gear. The opposite ends of the two transmission shafts are fixedly connected to a driven bevel gear that meshes with the driving bevel gear.

[0012] As a further description of the above technical solution: The top wall of the pad is fixedly connected to two uprights located near both ends. The top wall of each upright is fixedly connected to a suspension rod, and an infrared rangefinder is fixedly connected to the suspension rod.

[0013] As a further description of the above technical solution: The visual inspection device includes a line array camera located above the inspection conveyor belt and illumination lights located on both sides of the line array camera.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by setting up a lifting column, a base, a cantilever, a vertical rotating shaft, and a suction cup assembly, the suction cup assembly can use centrifugal force to flatten the soft, sheet-like leather when it rotates after adsorbing the leather. When the suction cup assembly releases the leather above the detection conveyor belt, the leather can fall onto the detection conveyor belt and be in a flat state at the same time. When the conveyor belt carries the leather past the line scan camera at the bottom of the vision inspection device, the line scan camera can fully acquire the image of the upper surface of the leather. This setup not only enables comprehensive inspection of one side of the leather, but also greatly improves the efficiency of leather loading.

[0015] 2. In this invention, by setting a positioning seat, connecting pipe, transition belt transmitter, lifting column, carrier plate, and tray, the transition belt transmitter receives the leather being transported on the detection conveyor belt. When the connecting pipe rotates, it can cause the transition belt transmitter to flip and place the leather on it with its reverse side onto the tray placed on the corresponding tray, thus realizing automatic reverse processing of the leather after single-sided detection. By setting a turntable and tray, the two trays can switch positions when the turntable rotates, and the reversed leather can be transferred to the suction cup assembly to pick up. The other tray is located at the position for transferring the reversed leather after detection. This greatly improves the efficiency of double-sided detection of leather.

[0016] 3. In this invention, by setting up an air box, a transmission pipe, a diversion pipe, and a nozzle, the nozzle can apply air pressure to the leather on the transmission belt. This air pressure prevents the transition belt conveyor from falling off when it rotates at low speed and drives the reverse side of the leather on the transmission belt. This setting makes the reverse side treatment of the leather more reliable, and at the same time can greatly reduce the inertial impact force of the belt conveyor with a certain weight, making the movement of the transition belt conveyor more stable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an automated detection device for leather surface defects proposed in this invention; Figure 2 This is a schematic diagram of the bottom structure of the visual inspection device of an automated detection equipment for leather surface defects proposed in this invention; Figure 3 for Figure 1 Rear structural diagram; Figure 4 This is a schematic diagram of the connection between the positioning seat and the transition belt transmitter of an automated detection device for leather surface defects proposed in this invention. Figure 5 for Figure 1 A schematic diagram of the bottom structure; Figure 6 This is a schematic diagram of the structure of the tray, carrier plate and turntable of an automated detection device for leather surface defects proposed in this invention; Figure 7 This is a schematic diagram of the structure of the carrier plate and turntable after explosion-prone unfolding of the automated detection device for leather surface defects proposed in this invention; Figure 8 for Figure 7 A schematic diagram of the bottom structure; Figure 9 This is a schematic diagram of the connection between the base and the lifting column of an automated detection device for leather surface defects proposed in this invention. Figure 10 This is a schematic diagram of the suction cup assembly, vertical rotating shaft, and cantilever connection of an automated detection device for leather surface defects proposed in this invention. Figure 11 for Figure 10 The main view; Figure 12 This is a schematic diagram of the structure of the air-ventilated turnover device of an automated detection device for leather surface defects proposed in this invention; Figure 13 for Figure 12 A schematic diagram of the structure after the explosion.

[0018] Legend: 1. Inspection table; 2. Inspection conveyor belt; 3. Vision inspection device; 4. Base; 1901. Upright pole; 19011. Suspension rod; 5. Lifting column one; 6. Cantilever; 61. Positioning sleeve; 7. Vertical rotating shaft; 8. Suction cup assembly; 81. Disc; 82. Leather suction cup; 9. Positioning seat; 91. Bearing shaft; 101. Connecting pipe; 102. Connecting arm; 103. Transition belt type transmitter; 1031. Frame; 1032. Conveyor belt; 140. Pallet; 1401. Transmission sleeve; 105. Carrier plate; 1051. Sub-rail; 1052. Base; 1053. Main shaft one; 10531. Drive gear; 106. Turntable; 10 61. Main rail; 1402. Slide plate; 107. Ventilation turntable; 1071. Inner sleeve; 10711. Annular groove; 10712. Through hole one; 1072. Outer sleeve; 10721. Through hole two; 108. Connecting joint; 109. Ventilation pipe; 110. Air box; 1101. Transmission pipe; 11011. Diverter pipe; 120. Nozzle; 130. Drive shaft; 1301. Passive bevel gear; 140. Support plate; 1401. Transmission sleeve; 150. Main shaft two; 1501. Active bevel gear; 160. Line array camera; 170. Lighting lamp; 180. Infrared rangefinder; 190. Pad; 200. Lifting column two. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example: Please refer to Figures 1-13 An automated inspection device for leather surface defects includes an inspection table 1, which serves as a support platform for the main body of the device. An inspection conveyor belt 2 and a vision inspection device 3 are mounted on the top of the inspection table 1. The inspection conveyor belt 3 is used to transport sheet-like, soft leather. When the inspection conveyor belt 3 operates, it can carry the leather past the area under the vision inspection device 3. The vision inspection device 3 includes a line scan camera 160 located above the inspection conveyor belt 2 and illumination lamps 170 located on both sides of the line scan camera 160. When the leather passes beneath the line scan camera 160, the line scan camera 160 captures an image of the leather surface. The surface defect processing module within the vision inspection device 3 performs surface defect analysis processing on the image extracted by the line scan camera 160. The illumination lamps 170 illuminate the upper surface of the leather.

[0020] In this technical solution, a base 4 is fixedly installed near the front end on one side of the testing table 1. The base 4 is located outside the testing table 1 and is fixedly installed on the ground. A lifting column 5 is rotatably connected to the top of the base 4. The lifting column 5 is electrically connected to the controller (PLC). In specific implementation, the lifting column 5 is a servo electric cylinder. A connecting shaft is fixedly installed at the bottom of the lifting column 5. The connecting shaft is sleeved in the connecting hole opened at the top of the base 4. The connecting shaft and the connecting hole are rotatably connected. A transmission disk is fixedly sleeved on the outside of the connecting shaft. A main shaft 3 is rotatably connected to the outside of the base 4 through a connecting plate. A transmission gear that meshes with the transmission disk is fixedly connected to the top of the main shaft 3. When the main shaft 3 rotates, it can drive the lifting column 5 to rotate relative to the base 4. In use, a control motor is fixedly connected below the connecting plate. The output shaft of the control motor is fixedly connected to the bottom of the main shaft 3. The control motor is a servo motor. The control motor provides driving force to the rotation of the main shaft 3. The control motor is electrically connected to the controller (PLC).

[0021] A cantilever 6 is fixedly connected to the top of the lifting column 5. When the lifting column 5 rotates, it drives the cantilever 6 to move. A vertical rotating shaft 7 is provided at the free end of the cantilever 6. When the cantilever 6 moves, it drives the vertical rotating shaft 7 to revolve. A suction cup assembly 8 is fixedly connected to the bottom of the vertical rotating shaft 7. When the vertical rotating shaft 7 rotates, it drives the suction cup assembly 8 to rotate. The function of the suction cup assembly 8 is to adsorb soft leather. When the vertical rotating shaft 7 rotates, it drives the leather to rotate through the suction cup assembly 8. After the leather rotates at a certain speed, it will automatically flatten out using centrifugal force. When the suction cup assembly 8 is located above the detection conveyor belt 2 and releases the leather, the leather will fall flat onto the detection conveyor belt 2. This can effectively avoid the problem of the leather on the detection conveyor belt 2 folding. When the flat leather passes through the vision inspection device 3, the vision inspection device 3 can perform a comprehensive inspection of the defects on the surface of the leather.

[0022] The suction cup assembly 8 includes a disc 81 and three circumferentially evenly distributed leather suction cups 82 fixedly disposed below the disc 81. The bottom end of the vertical rotating shaft 7 is fixedly connected to the middle of the top wall of the disc 81. When the vertical rotating shaft 7 rotates, it can drive the disc 81. A positioning sleeve 61 is fixedly disposed on the cantilever 6 and sleeved outside the vertical rotating shaft 7. The positioning sleeve 61 and the vertical rotating shaft 7 are rotatably connected. A gear 1 is fixedly sleeved on the top of the vertical rotating shaft 7. Then, a motor 1 is fixedly installed on the top of the cantilever 6. The output shaft of the motor 1 is fixedly connected to a gear 2 that meshes with the gear 1. The motor 1 is a servo motor. When in use, the motor 1 is electrically connected to a controller (PLC). A ventilation rotator 107 is sleeved outside the positioning sleeve 61. The function of the ventilation rotator 107 is to transmit the airflow required by the suction cup assembly 8. The air-ventilated rotating device 107 is provided with connectors 108 that are connected to each leather suction cup 82 via pipes. That is, the connectors 108 supply air to each leather suction cup 82 via pipes. The connectors 108 are fixed relative to the vertical rotating shaft 7. The air-ventilated rotating device 107 is provided with an air pipe 109 that is fixed relative to the positioning sleeve 61. In use, an air pump assembly is installed on the top wall of the cantilever 6. The air pump assembly is connected to the air pipe 109 via pipes. When the air pump assembly sucks air into the leather suction cup 82, the leather suction cup 82 generates suction. When the air pump assembly inflates the leather suction cup 82, the leather suction cup 82 can release the sheet leather it has adsorbed. Since the air pump assembly is prior art, its specific structure will not be described in this application.

[0023] In this embodiment, the ventilation rotator 107 includes an inner sleeve 1071 and an outer sleeve 1072. The inner sleeve 1071 is fixedly sleeved on the positioning sleeve 61 and located below the cantilever 6. The outer sleeve 1072 is sleeved outside the inner sleeve 1071 and the two are rotatably connected. The inner sleeve 1071 has an annular groove 10711 on its outer peripheral wall. The inner sleeve 1071 is hollow and has a through hole 10712 connecting the annular groove 10711 and the hollow cavity of the inner sleeve 1071. The outer sleeve 1072 is also hollow, with its inner peripheral wall located within the annular groove 10711. The inner peripheral wall of the outer sleeve 1072 has a through hole 10721 connecting its hollow cavity. A vent pipe 109 is fixedly installed on the top wall of the inner sleeve 1071 and communicates with its hollow cavity. A connector 108 is fixedly installed on the outer peripheral wall of the outer sleeve 1072 and communicates with its hollow cavity. The bottom wall of the outer sleeve 1072 is fixedly connected to the top wall of the disc 81 via a fixing rod. Therefore, when the disc 81 rotates, the outer sleeve 1072 rotates synchronously and supplies air to each leather suction cup 82. To ensure the sealing of the connection between the inner sleeve 1071 and the outer sleeve 1072, sealing rings can be installed on both sides of the annular groove 10711 and between the outer sleeve 1072. To ensure the smooth rotational connection between the inner sleeve 1071 and the outer sleeve 1072, a limiting ring can be fixedly connected to both the upper and lower sides of the outer sleeve 1072. The limiting ring is sleeved on the outside of the inner sleeve 1071, and a bearing is installed between the limiting ring and the inner sleeve 1071.

[0024] Furthermore, a positioning seat 9 is fixedly connected to one side of the testing station 1 near the rear end. A connecting tube 101 is rotatably connected to one side of the positioning seat 9. The outer wall of the connecting tube 101 is fixedly connected to a transition belt type transmitter 103 located at the rear end of the testing conveyor belt 2 via a connecting arm 102. When the connecting tube 101 rotates, it can drive the transition belt type transmitter 103 to the rear end of the testing conveyor belt 2. When the transition belt type transmitter 103 is located at the rear end of the testing conveyor belt 2 and is in a horizontal position, the height of the transition belt type transmitter 103 is slightly lower than that of the testing conveyor belt 2. When the transition belt type transmitter 103 is in operation, it can transfer the leather being transported on the testing conveyor belt 2 to itself.

[0025] A pad 190 is fixedly installed on one side of the testing table 1. The pad 190 is located on the outside of the testing table 1 and is fixedly connected to the ground. A carrier plate 105 is fixedly connected to the top wall of the pad 190 via a second lifting column 200. The function of the second lifting column 200 is to control the up and down movement of the carrier plate 105. The second lifting column 200 is a servo electric cylinder and is electrically connected to a controller (PLC). A turntable 106 is installed in the middle of the carrier plate 105. Two centrally symmetrical support plates 140 are installed on the upper part of the turntable 106. The function of the support plates 140 is to support trays for stacking sheet leather. The two support plates 140 and the turntable 106 are slidably engaged and slide in the same direction. Along the radial direction of the turntable 106, after the turntable 106 rotates to a certain position, when the distance between the two trays 140 is at its maximum, one tray 140 is located at the station where the suction cup assembly 8 picks up the leather, and the other tray 140 is located at the station where the transition belt conveyor 103 flips and transfers the leather on it. The effect of this transfer is to turn the leather inside out. When the two trays 140 are controlled to move towards each other to their limit positions, and then the turntable 106 is controlled to rotate 180° and then the two trays 140 are controlled to move in opposite directions to their limit positions, the suction cup assembly 8 can pick up the leather with the reverse side facing up, which facilitates defect detection on the reverse side of the leather.

[0026] In this embodiment, there are two lifting columns 200, which are respectively located near both ends of the carrier plate 105. The carrier plate 105 has a through-hole for rotatable connection with the turntable 106. The top of the carrier plate 105 is fixedly connected to the auxiliary rails 1051 located on both sides of the turntable 106. There are two auxiliary rails 1051 on the carrier plate 105. The top wall of the turntable 106 is fixedly connected to the main rail 1061. There are also two main rails 1061 on the turntable 106. The bottom of the support plate 140 is fixedly connected to the sliding plate 140, which is adapted to slide with the main rail 1061 and the auxiliary rail 1051. The main rail 1061 and the auxiliary rail 1051 have the same specifications. When the slide plate 1402 is collinear with the auxiliary rail 1051, it can slide between the two. The bottom of the carrier plate 105 is rotatably connected to the main shaft 1053 via the base 1052. In use, the bottom of the base 1052 is fixedly connected to the output shaft and the bottom of the main shaft 1053 is fixedly connected to the drive motor. The drive motor is a servo motor and is electrically connected to the controller (PLC). The top of the main shaft 1053 is fixedly connected to the drive gear 10531 that meshes with the outer peripheral wall of the turntable 106. In specific implementation, the outer peripheral of the turntable 106 is fixedly set with teeth that mesh with the drive gear 10531. Thus, when the main shaft 1053 rotates, it will drive the turntable 106 to rotate.

[0027] Furthermore, the bottom of the turntable 106 is rotatably connected to two coaxial and symmetrical drive shafts 130 relative to the center of the turntable 106. The bottom of the support plate 140 is fixedly connected to a drive sleeve 1401 that passes through and engages with the drive shafts 130. The drive sleeve 1401 is a threaded sleeve. The bottom of the turntable 106 is rotatably connected to a second main shaft 150. The bottom wall of the turntable 106 is fixedly connected to an output motor. The output shaft of the output motor is fixedly connected to the other end of the second main shaft 150. One end of the second main shaft 150 is fixedly connected to a driving bevel gear 1501. The opposite ends of the two drive shafts 130 are fixedly connected to a driven bevel gear 1301 that meshes with the driving bevel gear 1501. When the two drive shafts 130 rotate in opposite directions, they can drive the two support plates 140 to move synchronously in opposite directions.

[0028] In this embodiment, two uprights 1901 are fixedly connected to the top wall of the pad 190, respectively near both ends. A suspension rod 19011 is fixedly connected to the top wall of the uprights 1901, and an infrared rangefinder 180 is fixedly connected to the suspension rod 19011. When the two trays 140 are located at the leather transfer station and the leather retrieval station, respectively, an infrared rangefinder 180 corresponds to the top of each of the two trays 140. The function of the infrared rangefinder 180 is to monitor the height of the top layer of leather on the tray 140, thereby facilitating the control of the height of the carrier plate 105 and the height at which the suction cup assembly 8 retrieves the leather via the controller (PLC).

[0029] The transition belt transmitter 103 includes a frame 1031 and a transmission belt 1032 located within the frame 1031. One side of the frame 1031 is fixedly connected to one end of the connecting arm 102, and one side of the positioning seat 9 is fixedly connected to one side of the detection table 1. A bearing shaft 91, sleeved on the outside of the connecting tube 101, is fixedly connected to the rear side of the positioning seat 9. The bearing shaft 91 and the connecting tube 101 are rotatably connected. An intermediate gear is fixedly sleeved on the outside of the connecting tube 101. A main shaft four is rotatably connected to one side of the positioning seat 9. The main shaft four... The output shaft is fixedly connected to the transmission gear meshing with the intermediate gear. The output shaft and the main shaft are fixedly connected to the side of the positioning seat 9. The rotating motor is a servo motor and is electrically connected to the controller (PLC). When the connecting pipe 101 rotates, it can drive the entire transition belt transmitter 103 to rotate through the connecting arm 102. When the transition belt transmitter 103 rotates, it can transfer the sheet leather supported on the transmission belt 1032 to the tray placed above the pallet 140 at the leather transfer station.

[0030] The frame 1031 is equipped with infrared sensor components located on both sides of the conveyor belt 1032. The infrared sensor components are used to identify the position of the leather on the conveyor belt 1032. That is, when the leather moves to the middle of the conveyor belt 1032, the infrared sensor components will control the conveyor belt 1032 to stop running through the controller (PLC).

[0031] Furthermore, an air box 110 is fixedly connected to the outer wall of the connecting pipe 101, and an air inlet pipe is fixedly connected to the outer wall of the air box 110. During use, an intermittent air supply assembly (including an air pump and a solenoid control valve) is fixedly installed on the outer wall of the testing platform 1. The air inlet pipe is connected to the air outlet pipe of the air supply assembly via a hose. The air supply assembly is electrically connected to the controller (PLC). A transmission pipe 1101 is fixedly connected to the top wall of the air box 110, and a branch pipe 11011 is fixedly connected to the free end of the transmission pipe 1101. The outer wall of the branch pipe 11011... A row of nozzles 120 is fixedly connected. The nozzles 120 spray air towards the middle of the conveyor belt 1032. That is, when the nozzles 120 spray air, they blow air onto the middle of the sheet of leather placed on the conveyor belt 1032, so that the sheet of leather can be reliably attached to the conveyor belt 1032. After the transition belt conveyor 103 flips and moves the leather on it to the top of the tray, the nozzles 120 are controlled to stop spraying air. At this time, the leather will fall onto the tray. In use, the conveyor belt 1032 can be selected with a structure of evenly distributed through holes on the belt body.

[0032] Working principle: In use, an empty pallet is placed on the tray 140 on one side of the transition belt conveyor 103. The transition belt 103 is controlled to be located at the rear end of the detection conveyor belt 2 and in a horizontal state. Another pallet containing multiple layers of leather is placed on another tray 140 at the leather retrieval station. Then, the detection program of this equipment is started by pressing the start button on the control box fixed on the detection table 1. The lifting column 5 is controlled to rotate until the suction cup assembly 8 is above the leather. Then, the lifting column 5 is controlled to drive the cantilever to descend. The descent height is determined according to the position of the top leather measured by the corresponding laser rangefinder 180, so that the leather suction cup 82 on the suction cup assembly 8 presses against the upper surface of the top layer of leather, controlling the leather... Suction cup 82 draws in air and adsorbs the leather. Then, the lifting column 5 raises the cantilever 6, and the lifting column 5 rotates the cantilever 6 so that the adsorbed leather is directly above the detection conveyor belt 2. At this point, the outer periphery of the leather sags due to its softness. The vertical shaft 7 then rotates at a low speed, and the leather is brought to a near-flat state under centrifugal force. The lifting column 5 then descends until the leather is close to the detection conveyor belt 2. At this point, the leather suction cup 82 releases air, allowing the leather to fall onto the detection conveyor belt 2 in a flat state. The operation of the detection conveyor belt 2 moves the flat, sheet-like leather on it. As the leather passes the line scan camera 160, the lighting lamp 170 provides supplementary illumination. Line scan camera 160 captures an image of the upper surface of the passing leather. The surface defect detection module in the vision inspection device 3 analyzes and processes the image captured by line scan camera 160. The analysis and processing results are sent to a display screen fixedly mounted at one end of the vision inspection device 3. As the inspection conveyor belt 2 continues to transport the leather, the inspected leather is transferred to the conveyor belt 1032. Then, the connecting pipe 101 rotates, causing the entire transition belt conveyor 103 to flip. The leather on the conveyor belt 1032 is pulled to the top of another tray. The leather falls onto the tray by its own weight. The height of the leather above the tray is obtained by another infrared rangefinder 180. The controller controls the entire process through the lifting column 200. The carrier plate 105 is lowered to a certain height, so that the leather stacked on the tray is aligned. This process is repeated to detect defects on one side of all the leather pieces. After the defects on one side of all the leather pieces are detected, the main shaft 150 is controlled to rotate. Under the meshing of the active bevel gear 1501 and the passive bevel gear 1301, the two drive shafts 130 rotate synchronously in opposite directions. The two pallets 140 are driven and move in opposite directions to above the turntable 106. Then the turntable 106 is controlled to rotate 180°, and the drive shaft 130 is controlled to rotate in the opposite direction, so that the two pallets 140 switch positions. At this time, the suction cup assembly 8 is controlled to transfer the leather according to the above control method, so that the other side of the leather can be detected for surface defects.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automated inspection device for leather surface defects, comprising an inspection table (1), wherein an inspection conveyor belt (2) is disposed on the top of the inspection table (1) and a visual inspection device (3) is disposed above the inspection conveyor belt (2), characterized in that, A base (4) is fixedly installed on one side of the testing platform (1) near the front end. A lifting column (5) is rotatably connected to the top of the base (4). A cantilever (6) is fixedly connected to the top of the lifting column (5). A vertical rotating shaft (7) is provided at the free end of the cantilever (6). A suction cup assembly (8) is fixedly connected to the bottom of the vertical rotating shaft (7). A positioning seat (9) is fixedly connected to one side of the testing platform (1) near the rear end. A connecting tube (101) is rotatably connected to one side of the positioning seat (9). The outer wall of the connecting tube (101) is connected by a connecting rod. The connecting arm (102) is fixedly connected to the transition belt transmitter (103) located at the rear end of the detection conveyor belt (2). A pad (190) is fixedly installed on one side of the detection table (1). A carrier plate (105) is fixedly connected to the top wall of the pad (190) through the second lifting column (200). A turntable (106) is provided in the middle of the carrier plate (105). Two centrally symmetrical support plates (140) are provided on the upper part of the turntable (106). The two support plates (140) and the turntable (106) slide together and slide in the radial direction of the turntable (106).

2. The automated detection device for leather surface defects according to claim 1, characterized in that, The suction cup assembly (8) includes a disc (81) and three circumferentially evenly distributed leather suction cups (82) fixedly disposed below the disc (81). The bottom end of the vertical rotating shaft (7) is fixedly connected to the middle of the top wall of the disc (81). A positioning sleeve (61) is fixedly disposed on the cantilever (6) and sleeved outside the vertical rotating shaft (7). The positioning sleeve (61) is rotatably connected to the vertical rotating shaft (7). A ventilation rotator (107) is sleeved outside the positioning sleeve (61). The ventilation rotator (107) is provided with connectors (108) that are respectively connected to each leather suction cup (82) through pipes. The connectors (108) are fixed relative to the vertical rotating shaft (7). A ventilation pipe (109) is provided on the ventilation rotator (107) that is fixed relative to the positioning sleeve (61).

3. The automated detection device for leather surface defects according to claim 2, characterized in that, The ventilation rotator (107) includes an inner sleeve (1071) and an outer sleeve (1072). The inner sleeve (1071) is fixedly sleeved on the positioning sleeve (61) and located below the cantilever (6). The outer sleeve (1072) is sleeved outside the inner sleeve (1071) and the two are rotatably connected. An annular groove (10711) is formed on the outer peripheral wall of the inner sleeve (1071). The inner sleeve (1071) is a hollow structure and has a through hole (10712) that connects the annular groove (10711) and the hollow cavity of the inner sleeve (1071). The outer sleeve (1072) is also a hollow structure and its inner peripheral wall is located in the annular groove (10711). The inner peripheral wall of the outer sleeve (1072) is provided with a through hole (10721) that connects to its hollow cavity. The vent pipe (109) is fixedly installed on the top wall of the inner sleeve (1071) and communicates with the hollow cavity of the inner sleeve (1071). The connector (108) is fixedly installed on the outer peripheral wall of the outer sleeve (1072) and communicates with the hollow cavity of the outer sleeve (1072). The bottom wall of the outer sleeve (1072) is fixedly connected to the top wall of the disc (81) by a fixing rod.

4. The automated detection device for leather surface defects according to claim 1, characterized in that, The transition belt transmitter (103) includes a frame (1031) and a transmission belt (1032) located inside the frame (1031). One side of the frame (1031) is fixedly connected to one end of the connecting arm (102). An air box (110) is fixedly connected to the outer wall of the connecting pipe (101). A transmission pipe (1101) is fixedly connected to the top wall of the air box (110). A diversion pipe (11011) is fixedly connected to the free end of the transmission pipe (1101). A row of nozzles (120) is fixedly connected to the outer wall of the diversion pipe (11011). One side of the positioning seat (9) is fixedly connected to one side of the detection table (1). A bearing shaft (91) sleeved on the outside of the connecting pipe (101) is fixedly connected to the rear side of the positioning seat (9). The bearing shaft (91) and the connecting pipe (101) are rotatably connected.

5. An automated detection device for leather surface defects according to claim 1, characterized in that, The number of the lifting columns (200) is two and they are respectively set near the two ends of the carrier plate (105). The middle of the carrier plate (105) is provided with a mating hole that is rotatably connected to the turntable (106). The top of the carrier plate (105) is fixedly connected to the auxiliary rails (1051) located on both sides of the turntable (106). The top wall of the turntable (106) is fixedly connected to the main rail (1061). The bottom of the support plate (140) is fixedly connected to the slide plate (1402) that is slidably adapted to the main rail (1061) and the auxiliary rail (1051). The bottom of the carrier plate (105) is rotatably connected to the main shaft (1053) through the base (1052). The top of the main shaft (1053) is fixedly connected to the drive gear (10531) that meshes with the outer peripheral wall of the turntable (106).

6. An automated detection device for leather surface defects according to claim 5, characterized in that, The bottom of the turntable (106) is rotatably connected to two coaxial transmission shafts (130) that are symmetrical about the center of the turntable (106). The bottom of the support plate (140) is fixedly connected to a transmission sleeve (1401) that is screwed through the transmission shaft (130). The bottom of the turntable (106) is rotatably connected to a second main shaft (150). One end of the second main shaft (150) is fixedly connected to a driving bevel gear (1501). The opposite ends of the two transmission shafts (130) are fixedly connected to a driven bevel gear (1301) that meshes with the driving bevel gear (1501).

7. An automated detection device for leather surface defects according to claim 1, characterized in that, The top wall of the pad (190) is fixedly connected to two uprights (1901) located near both ends. The top wall of the uprights (1901) is fixedly connected to a suspension rod (19011), and an infrared rangefinder (180) is fixedly connected to the suspension rod (19011).

8. An automated detection device for leather surface defects according to claim 1, characterized in that, The visual inspection device (3) includes a line array camera (160) located above the inspection conveyor belt (2) and lighting lamps (170) located on both sides of the line array camera (160).

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